/*
** Copyright (C) 2009 Joshua Brent Marsh <joshua@icub3d.com>
**  
** This file is part of icub3d-adt
**
** icub3d-adt is free sofware; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 3 of the License, or
** (at your option) any later version.
**  
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
** GNU General Public License for more details.
**  
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
**  
*/

/* $Id$ */

#ifndef ICUB3D_PQUEUE_H
#define ICUB3D_PQUEUE_H 1

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdlib.h>

#include "function_prototypes.h"
#include "btree.h"
#include "heap.h"

typedef
enum pqueue_type
  {
    HEAP_MIN,
    HEAP_MAX,
    MIN,
    MAX
  } PQueueType;

typedef 
struct pqueue
{
  union {
    Btree *tree;
    Heap *heap;
  } storage;
  size_t size;
  PQueueType type;
  destroy_func *dfunc;
} PQueue;

PQueue * pqueue_create (PQueueType type, destroy_func *dfunc);
void pqueue_destroy (PQueue *queue);

#define pqueue_size(p) (p)->size

void * pqueue_enqueue (PQueue *queue, size_t priority, void *item);

void * pqueue_peek (PQueue *queue);
void * pqueue_dequeue (PQueue *queue);

#endif /* ICUB3D_PQUEUE_H */
